Hi Geoffrey, I have modified the LocalSearchSolverConfig class to accept the <scoreDsl> tag. To use this tag need gonfigure the XML solverConfig file adding the path of Drl file and Dsl file associated in two line consecutive in the configuration file. This code is not the best but is a start.... I send you the code if it can be useful. I would also ask when it launches the new version of the solver, and if this will also include other local search algorithms than Tabu Search with kind regards, Marco LocalSearchSolverConfig class Code /**  * @author Geoffrey De Smet  */ @XStreamAlias("localSearchSolver") public class LocalSearchSolverConfig {     private Long randomSeed = null;     @XStreamImplicit(itemFieldName = "scoreDrl")     private List<String> scoreDrlList = null;     @XStreamImplicit(itemFieldName = "scoreDsl")//FIXME adding DslList     private List<String> scoreDslList = null;     @XStreamAlias("scoreDefinition")     private ScoreDefinitionConfig scoreDefinitionConfig = new ScoreDefinitionConfig();     private StartingSolutionInitializer startingSolutionInitializer = null;     private Class<StartingSolutionInitializer> startingSolutionInitializerClass = null;     @XStreamAlias("termination")     private TerminationConfig terminationConfig = new TerminationConfig(); // TODO this new is pointless due to xstream     @XStreamAlias("deciderScoreComparatorFactory")     private DeciderScoreComparatorFactoryConfig deciderScoreComparatorFactoryConfig             = new DeciderScoreComparatorFactoryConfig();     @XStreamAlias("selector")     private SelectorConfig selectorConfig = new SelectorConfig();     @XStreamAlias("accepter")     private AccepterConfig accepterConfig = new AccepterConfig();     @XStreamAlias("forager")     private ForagerConfig foragerConfig = new ForagerConfig();     public Long getRandomSeed() {         return randomSeed;     }     public void setRandomSeed(Long randomSeed) {         this.randomSeed = randomSeed;     }     public List<String> getScoreDrlList() {         return scoreDrlList;     }     public void setScoreDrlList(List<String> scoreDrlList) {         this.scoreDrlList = scoreDrlList;     }     public List<String> getScoreDslList() {         return scoreDslList;     }     public void setScoreDslList(List<String> scoreDslList) {         this.scoreDslList = scoreDslList;     }     public ScoreDefinitionConfig getScoreDefinitionConfig() {         return scoreDefinitionConfig;     }     public void setScoreDefinitionConfig(ScoreDefinitionConfig scoreDefinitionConfig) {         this.scoreDefinitionConfig = scoreDefinitionConfig;     }     public StartingSolutionInitializer getStartingSolutionInitializer() {         return startingSolutionInitializer;     }     public void setStartingSolutionInitializer(StartingSolutionInitializer startingSolutionInitializer) {         this.startingSolutionInitializer = startingSolutionInitializer;     }     public Class<StartingSolutionInitializer> getStartingSolutionInitializerClass() {         return startingSolutionInitializerClass;     }     public void setStartingSolutionInitializerClass(Class<StartingSolutionInitializer> startingSolutionInitializerClass) {         this.startingSolutionInitializerClass = startingSolutionInitializerClass;     }     public TerminationConfig getTerminationConfig() {         return terminationConfig;     }     public void setTerminationConfig(TerminationConfig terminationConfig) {         this.terminationConfig = terminationConfig;     }     public DeciderScoreComparatorFactoryConfig getDeciderScoreComparatorFactoryConfig() {         return deciderScoreComparatorFactoryConfig;     }     public void setDeciderScoreComparatorFactoryConfig(             DeciderScoreComparatorFactoryConfig deciderScoreComparatorFactoryConfig) {         this.deciderScoreComparatorFactoryConfig = deciderScoreComparatorFactoryConfig;     }     public SelectorConfig getSelectorConfig() {         return selectorConfig;     }     public void setSelectorConfig(SelectorConfig selectorConfig) {         this.selectorConfig = selectorConfig;     }     public AccepterConfig getAccepterConfig() {         return accepterConfig;     }     public void setAccepterConfig(AccepterConfig accepterConfig) {         this.accepterConfig = accepterConfig;     }     public ForagerConfig getForagerConfig() {         return foragerConfig;     }     public void setForagerConfig(ForagerConfig foragerConfig) {         this.foragerConfig = foragerConfig;     }     // ************************************************************************     // Builder methods     // ************************************************************************     public LocalSearchSolver buildSolver() {         DefaultLocalSearchSolver localSearchSolver = new DefaultLocalSearchSolver();         if (randomSeed != null) {             localSearchSolver.setRandomSeed(randomSeed);         } else {             localSearchSolver.setRandomSeed(0L);         }         localSearchSolver.setRuleBase(buildRuleBase());         ScoreDefinition scoreDefinition = scoreDefinitionConfig.buildScoreDefinition();         localSearchSolver.setScoreDefinition(scoreDefinition);         // remove when score-in-solution refactor         localSearchSolver.setScoreCalculator(scoreDefinitionConfig.buildScoreCalculator());         localSearchSolver.setStartingSolutionInitializer(buildStartingSolutionInitializer());         localSearchSolver.setBestSolutionRecaller(new BestSolutionRecaller());         localSearchSolver.setTermination(terminationConfig.buildTermination(scoreDefinition));         localSearchSolver.setDecider(buildDecider());         return localSearchSolver;     }     private RuleBase buildRuleBase() {         PackageBuilder packageBuilder = new PackageBuilder();         if(scoreDrlList!=null)             for (String scoreDrl : scoreDrlList) {                 InputStream scoreDrlIn = getClass().getResourceAsStream(scoreDrl);                 if (scoreDrlIn == null) {                     throw new IllegalArgumentException("scoreDrl (" + scoreDrl + ") does not exist as a classpath resource.");                 }                 try {                     packageBuilder.addPackageFromDrl(new InputStreamReader(scoreDrlIn, "utf-8"));                 } catch (DroolsParserException e) {                     throw new IllegalArgumentException("scoreDrl (" + scoreDrl + ") could not be loaded.", e);                 } catch (IOException e) {                     throw new IllegalArgumentException("scoreDrl (" + scoreDrl + ") could not be loaded.", e);                 } finally {                     IOUtils.closeQuietly(scoreDrlIn);                 }             }         //FIXME scoreDslList addPackageFrom(Drl,Dsl)         if(scoreDslList!=null){             String scoreDrl=null;             String scoreDsl=null;             for(int i=0;i< scoreDslList.size();i++){                 if(scoreDslList.get(i).endsWith("drl")){                     scoreDrl=scoreDslList.get(i);                 }                 else{                     scoreDsl=scoreDslList.get(i);                 }                 if(scoreDrl!=null&&scoreDsl!=null){                     InputStream scoreDrlIn = getClass().getResourceAsStream(scoreDrl);                     InputStream scoreDslIn = getClass().getResourceAsStream(scoreDsl);                     if (scoreDrlIn == null || scoreDslIn == null) {                         throw new IllegalArgumentException("score does not exist as a classpath resource.");                     }                     try {                         packageBuilder.addPackageFromDrl(new InputStreamReader(scoreDrlIn, "utf-8"),new InputStreamReader(scoreDslIn, "utf-8"));                     } catch (DroolsParserException e) {                         throw new IllegalArgumentException("scoreDrl  could not be loaded.", e);                     } catch (IOException e) {                         throw new IllegalArgumentException("scoreDrl could not be loaded.", e);                     } finally {                         IOUtils.closeQuietly(scoreDrlIn);                     }                     scoreDrl=null;                     scoreDsl=null;                 }             }         }         RuleBaseConfiguration ruleBaseConfiguration = new RuleBaseConfiguration();         RuleBase ruleBase = RuleBaseFactory.newRuleBase(ruleBaseConfiguration);         if (packageBuilder.hasErrors()) {             throw new IllegalStateException("There are errors in the scoreDrl's:"                     + packageBuilder.getErrors().toString());         }         ruleBase.addPackage(packageBuilder.getPackage());         return ruleBase;     }     public StartingSolutionInitializer buildStartingSolutionInitializer() {         if (startingSolutionInitializer != null) {             return startingSolutionInitializer;         } else if (startingSolutionInitializerClass != null) {             try {                 return startingSolutionInitializerClass.newInstance();             } catch (InstantiationException e) {                 throw new IllegalArgumentException("startingSolutionInitializerClass ("                         + startingSolutionInitializerClass.getName()                         + ") does not have a public no-arg constructor", e);             } catch (IllegalAccessException e) {                 throw new IllegalArgumentException("startingSolutionInitializerClass ("                         + startingSolutionInitializerClass.getName()                         + ") does not have a public no-arg constructor", e);             }         } else {             return null;         }     }     private Decider buildDecider() {         DefaultDecider decider = new DefaultDecider();         decider.setDeciderScoreComparator(deciderScoreComparatorFactoryConfig.buildDeciderScoreComparatorFactory());         decider.setSelector(selectorConfig.buildSelector());         decider.setAccepter(accepterConfig.buildAccepter());         decider.setForager(foragerConfig.buildForager());         return decider;     }     public void inherit(LocalSearchSolverConfig inheritedConfig) {         if (randomSeed == null) {             randomSeed = inheritedConfig.getRandomSeed();         }         if (scoreDrlList == null) {             scoreDrlList = inheritedConfig.getScoreDrlList();         } else {             List<String> inheritedScoreDrlList = inheritedConfig.getScoreDrlList();             if (inheritedScoreDrlList != null) {                 for (String inheritedScoreDrl : inheritedScoreDrlList) {                     if (!scoreDrlList.contains(inheritedScoreDrl)) {                         scoreDrlList.add(inheritedScoreDrl);                     }                 }             }         }         //FIXME scoreDSLlist         if(scoreDslList ==null){             scoreDslList=inheritedConfig.getScoreDslList();         }else{             List<String> inheritedScoreDslList=inheritedConfig.getScoreDslList();             if(inheritedScoreDslList != null){                 for(String inheritedScoreDsl : inheritedScoreDslList){                     if(!scoreDslList.contains(inheritedScoreDsl)){                         scoreDslList.add(inheritedScoreDsl);                     }                 }             }         }         if (scoreDefinitionConfig == null) {             scoreDefinitionConfig = inheritedConfig.getScoreDefinitionConfig();         } else if (inheritedConfig.getScoreDefinitionConfig() != null) {             scoreDefinitionConfig.inherit(inheritedConfig.getScoreDefinitionConfig());         }         if (startingSolutionInitializer == null && startingSolutionInitializerClass == null) {             startingSolutionInitializer = inheritedConfig.getStartingSolutionInitializer();             startingSolutionInitializerClass = inheritedConfig.getStartingSolutionInitializerClass();         }         if (terminationConfig == null) {             terminationConfig = inheritedConfig.getTerminationConfig();         } else if (inheritedConfig.getTerminationConfig() != null) {             terminationConfig.inherit(inheritedConfig.getTerminationConfig());         }         if (deciderScoreComparatorFactoryConfig == null) {             deciderScoreComparatorFactoryConfig = inheritedConfig.getDeciderScoreComparatorFactoryConfig();         } else if (inheritedConfig.getDeciderScoreComparatorFactoryConfig() != null) {             deciderScoreComparatorFactoryConfig.inherit(inheritedConfig.getDeciderScoreComparatorFactoryConfig());         }         if (selectorConfig == null) {             selectorConfig = inheritedConfig.getSelectorConfig();         } else if (inheritedConfig.getSelectorConfig() != null) {             selectorConfig.inherit(inheritedConfig.getSelectorConfig());         }         if (accepterConfig == null) {             accepterConfig = inheritedConfig.getAccepterConfig();         } else if (inheritedConfig.getAccepterConfig() != null) {             accepterConfig.inherit(inheritedConfig.getAccepterConfig());         }         if (foragerConfig == null) {             foragerConfig = inheritedConfig.getForagerConfig();         } else if (inheritedConfig.getForagerConfig() != null) {             foragerConfig.inherit(inheritedConfig.getForagerConfig());         }     } }